An hour later the snow was still coming down but the city looked like this as the morning brightened the scene.
Finally, to create the image below I combined the two photos as layers in Photoshop with the darker night scene placed in a layer above the white snow image. I then changed the night shot layer to "Color" mode and used opacity to dial down its intensity. After collapsing the two image I then added an overlay layer from my MCP Actions "Sunrise Overlays" with its mode set to "Soft Light".
The image below from my soon-to-be-released MCP Actions "Sunrise Overlays" pack creates a white vignette when it is placed as a layer over another image and its mode is changed to "Hard Light". The it can be tweaked by rotating it and placing a mask on it to paint out some areas to suit.